#define _CRT_SECURE_NO_WARNINGS  1

class Solution {
public:
    void reverseString(vector<char>& s) {
        int left = 0;
        int right = s.size() - 1;
        char tmp = 0;
        int size = 0;
        while (left < right)
        {
            tmp = s[left];
            s[left] = s[right];
            s[right] = tmp;

            left++;
            right--;
        }

    }
};